Core - Java Programming Interview Questions and Answers | LucentBlackBoard

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11.	What is difference between Path and Classpath?
	Path and Classpath are operating system level environment variales. Path is used define where the system can find the executables(.exe) files and classpath is used to specify the location .class files.

12.	What are local variables?
	Local varaiables are those which are declared within a block of code like methods. Local variables should be initialised before accessing them.

13.	What are instance variables?
	Instance variables are those which are defined at the class level. Instance variables need not be initialized before using them as they are automatically initialized to their default values.

14.	How to define a constant variable in Java?
	The variable should be declared as static and final. So only one copy of the variable exists for all instances of the class and the value can't be changed also. static final int PI = 2.14; is an example for constant.

15.	Should a main() method be compulsorily declared in all java classes?
	No not required. main() method should be defined only if the source class is a java application.

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